The Mangifera indica oil is a nonedible vegetable oil, which is available in large quantities in mango cultivating countries including India. Very little published work has been found on transesterification process. In present study, the transesterification processes with homogeneous catalysts like NaOH, KOH and heterogeneous solid catalysts like nano MgO (crystal size 6-42 nm, BET surface area 50 m 2 /gm), nano ZnO (crystal size 15-48 nm, BET surface area 12 m 2 / gm), and nano SiO 2 (crystal size 1-44 nm, BET surface area 110 m 2 /gm) for optimizing production process of Mangifera indica oil methyl ester (MOME) have been investigated. Effect of input parameters viz. methanol-to-oil molar ratio, catalyst type and its loading, reaction temperature, stirrer speed, and reaction time on the yield of MOME was studied by applying the orthogonal experimental array L 25 . ANOVA (F-test at P 5 0.05) and grey relational technique were used for optimization of yield. The optimal combination of six input variables was obtained for optimized yield of (MOME) biodiesel. The optimal combination so obtained was further confirmed through experiments. Methanol-to-oil molar ratio, catalyst type and catalyst loading were the most influencing parameters. The biodiesel produced is within the limits prescribed by EN-14214 standard.
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